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REGULATORY FRAMEWORK - FFSU - Impact in the Company (Details) - ARS ($) $ in Millions | Dec. 31, 2017 | Oct. 01, 2012 | Sep. 13, 2012 | Mar. 31, 2011 | Jan. 31, 2011
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Regulatory framework |  |  |  |  |
Unrecorded accounts receivable | $ 2,925 |  |  |  |
Investments included in the unrecorded accounts receivable | 2,691 |  |  |  |
Deductions included in the unrecorded accounts receivable | 1,033 |  |  |  |
Deposit payable, as required by the CNC |  |  | $ 208 |  |
Personal |  |  |  |  |
Regulatory framework |  |  |  |  |
Deposits with the Bank, SU |  |  |  |  | $ 112
Investment amount of the project for the development of a network infrastructure in locations in the Northern Region of Argentina with no mobile coverage |  |  |  | $ 70 |
Deposits with the CNC, under protest |  | $ 23 |  |  |
SU Fund Administrative Appeals | Minimum |  |  |  |  |
Regulatory framework |  |  |  |  |
Net assets (liabilities) | (799) |  |  |  |
SU Fund Administrative Appeals | Maximum |  |  |  |  |
Regulatory framework |  |  |  |  |
Net assets (liabilities) | $ 2,925 |  |  |  |

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